I am the last one to defend SAP, but they do have an API first approach since some time, check this out: https://api.sap.com/products/SAPS4HANACloud/apis/all ht

I am the last one to defend SAP, but they do have an API first approach since some time, check this out: https://api.sap.com/products/SAPS4HANACloud/apis/all https://api.sap.com/products/SAPS4HANACloud/apis/all Also edge cases are taken care of, sometimes before you even small updates, via notes, mostly tax regulation changes. So yeah, for these things SAP is really made for. If you have a SAP account, you can check out, just to see how many changes are coming in: https://launchpad.support.sap.com/#/solutions/notesv2/?q=polish%2520tax https://launchpad.support.sap.com/#/solutions/notesv2/?q=pol...